package ocamlgraph

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type point
val ccw : point -> point -> point -> bool

The counterclockwise relation ccw p q r states that the circle through points (p,q,r) is traversed counterclockwise when we encounter the points in cyclic order p,q,r,p,... *

val in_circle : point -> point -> point -> point -> bool

The relation in_circle p q r s states that s lies inside the circle (p,q,r) if ccw p q r is true, or outside that circle if ccw p q r is false.